Analog Clock with openFrameworks

ofClock.cpp

#include "ofClock.h"

ofClock::ofClock()
{
	//Make everything looking nice and smooth.
	ofSetCircleResolution(100);
	ofEnableSmoothing();

	//Set size & position of our clock
	if( ofGetHeight() < ofGetWidth() )
		radius = (ofGetHeight()/2)-20;
	else
		radius = (ofGetWidth()/2)-20;
	
	top = (ofGetHeight()/2);
	left = (ofGetWidth()/2);
}

void ofClock::update( int sec, int min, int hour ){
    
	secondsAngle = 6 * sec;
	minutesAngle = 6 * min;
	hoursAngle = 30 * hour + (min / 2);
}

void ofClock::draw(){
    
	//Set the coortinatesystem to the center of the clock. 
	ofPoint circle_center = ofPoint( left, top );
	ofTranslate(circle_center);
	ofRotateZ(-90);
    
	//Draw background of the clock
	ofSetHexColor(0xbbbbbb);
	ofFill();
	ofCircle( ofPoint(0,0), radius );
    
	//Draw Outline of the clock
	ofSetLineWidth( (radius/100)*4 );
	ofNoFill();
	ofSetHexColor(0x888888);
	ofCircle( ofPoint(0,0), radius );
    
	//Draw the clock face
	ofSetLineWidth(1);
    
	for(int i=0;i<12;i++){
		ofRotateZ( 30 );
		
		ofFill();
		ofRect( ofPoint( (radius/10)*8, -((radius/100)*2) ), (radius/100)*20, (radius/100)*4 );
		ofNoFill();
		ofRect( ofPoint( (radius/10)*8, -((radius/100)*2) ), (radius/100)*20, (radius/100)*4 );
	}
    
	//Draw the hour hand
	ofPushMatrix(); 
	
	ofSetHexColor(0xFF0000);
	ofRotateZ( hoursAngle );
	
	ofFill();
	ofRect( 0,-((radius/100)*5),(radius/10)*6, (radius/100)*10 );
	ofNoFill();
	ofRect( 0,-((radius/100)*5),(radius/10)*6, (radius/100)*10 );
	
	ofPopMatrix();
	
	//Draw the minute hand
	ofPushMatrix();
    
	ofSetHexColor(0xFF6666);
	ofRotateZ( minutesAngle );
	
	ofFill();
	ofRect( 0,-((radius/100)*4),(radius/10)*7, (radius/100)*8 );
	ofNoFill();	
	ofRect( 0,-((radius/100)*4),(radius/10)*7, (radius/100)*8 );
    
	ofPopMatrix();
	
	//Draw the second hand
	ofPushMatrix();
	
	ofSetHexColor(0xFF9999);
	ofRotateZ( secondsAngle );
	
	ofFill();
	ofRect( -((radius/100)*2),-((radius/100)*2),(radius/10)*9, (radius/100)*4 );
	ofNoFill();	
	ofRect( -((radius/100)*2),-((radius/100)*2),(radius/10)*9, (radius/100)*4 );
    
	ofPopMatrix();
	
	ofFill();
	ofSetHexColor(0xFF9999);
	ofCircle( ofPoint(0,0), (radius/100)*6 );
}

ofClock.h

#ifndef _OF_CLOCK
#define _OF_CLOCK

#include "ofMain.h"

class ofClock {

public:
	ofClock();

	void update( int, int , int );
	void draw();
        
private:
	int radius;

	int top;
	int left;

	float secondsAngle;
	float minutesAngle;
	float hoursAngle;
}; 

#endif

Thanks for this code - was just using it to learn about OF transforms. However note that the returned values for ofGetWidth / ofGetHeight in a constructor will always return 1024 x 768 regardless of the true window size. The way around this is to switch out the constructor for a setup() method and call it from ofApp.setup()